Design And Fabrication Of Chevron-Notch Plain-Strain Fracture Toughness Testing System For Metallic Materials
Fracture toughness is a quantitative property of the material. Fracture toughness measures the ability of a material containing a flaw to withstand an applied load. The most common method of measuring plain strain fracture toughness for metallic materials is standardized in the ASTM E399. Howev...
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| Format: | Monograph |
| Language: | English |
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Universiti Sains Malaysia
2019
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| Online Access: | http://eprints.usm.my/58294/ http://eprints.usm.my/58294/1/Design%20And%20Fabrication%20Of%20Chevron-Notch%20Plain-Strain%20Fracture%20Toughness%20Testing%20System%20For%20Metallic%20Materials.pdf |
| Summary: | Fracture toughness is a quantitative property of the material. Fracture
toughness measures the ability of a material containing a flaw to withstand an
applied load. The most common method of measuring plain strain fracture toughness
for metallic materials is standardized in the ASTM E399. However, it is widely
acknowledged that the method is quite tedious. ASTM E1304 offers several advantages
over the standard method of the ASTM E399. This research is, therefore, to develop
and fabricate the Chevron-Notch plain strain fracture toughness testing system for
metallic material according to ASTM E1304.
The Chevron-Notch plain strain fracture toughness testing system was validated
by determining the chevron-notch plane-strain fracture toughness of KIvM of aluminium
alloy 5052 using Ultimate Testing Machine Instron 3367. By using this test, the plain�strain fracture toughness KQvM of the aluminium 5052 was defined. Before conducting
the fracture toughness test, a tensile test was conducted, and the yield strength of the
material was calculated. In this experiment, the digital image correlation, DIC was used
to measure the displacement of the crack mouth opening displacement, CMOD. From
the DIC displacement fields, the CMOD value as a function of load was successfully
determined. The CMOD value increases when the applied load increases.
However, the plane-strain chevron-notch fracture toughness, KIvM of Al 5052
obtained in this study is considered invalid as the value of the width, Bcalculate is higher
than the actual width, B value. The fracture toughness of the specimen is KQvM that we calculated is higher than the real fracture toughness. These finding results illustrate the chevron-notch test need to improve by more strategical dimensions to design the
specimen and jig and create the methodological framework to develop a complex pecimen. |
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